I bought a number of extensions but on this machine running Windows 7Pro the Extension Manager will not load my extensions. It gives me messages like "The extension will not be installed it requires Dreanweaver 9.0 or greater"

I bought a number of extensions but on this machine running Windows 7Pro the Extension Manager will not load my extensions. It gives me messages like "The extension will not be installed it requires Dreanweaver 9.0 or greater" (with Solutions for Web Calendar) I tried uninstalling it and reinstalling The Extension Manager but it does the same thing. Should I completely uninstall every program in CC 2015 and start over. It works fine on my other computer (Windows 10)?